File:1972 - Mack Trucks World Headquarters Allentown PA.jpg

English: Mack Trucks World Headquarters Allentown PA

In 1905, the Mack Brothers of Brooklyn, New York decided to open a second production plant for vehicles in an old foundry on the south side of Allentown. During the 20th Century, the company expanded and grew, and several other assembly plants were established in Allentown. In 1965, Mack announced that its corporate headquarters would move to Allentown from Brooklyn in order to be closer to the main assembly plant. Construction of a new Mack World Headquarters building began, and on April 28, 1970, it officially opened.

In January 1986, after posting a net loss of nearly $65 million for the third quarter of the previous year, Mack announced that it would close its Allentown plants and consolidate all of its production at its newest plant in Macungie, a suburb of Allentown. The losses continued and the company was sold first to Renault in 1990, then in 2000 to AB Volvo. In 2009, Mack’s corporate headquarters, along with all the operations that had been performed in Allentown, moved to Volvo’s campus in Greensboro, North Carolina. The company's Macungie assembly plant still remains open producing vehicles for the North American market.

Today the former headquarters building is leased office space for several companies, operated by a property management company.